Multi-Band Amplifier, Method for Controlling Thereof

1. A multi-band amplifier, comprising: a first amplifying unit connected to a first antenna stage so as to transmit and receive a signal within a first frequency band; a second amplifying unit connected to a second antenna stage so as to transmit and receive a signal within a second frequency band; and a switching control unit configured to generate first and second control signals based on common control voltages, and to output the first control signal to the first amplifying unit and output the second signal to the second amplifying unit, wherein the first amplifying unit configured to amplify the signal within the first frequency band, and to alternate transmitting and receiving the signal within the first frequency band by performing a switching operation depending on the first control signal, and the second amplifying unit configured to amplify the signal within the second frequency band, and to alternate transmitting and receiving the signal within the second frequency band by performing a switching operation depending on the second control signal.

2. The multi-band amplifier of claim 1 , wherein the switching control unit includes a first decoder generating the first and second control signals by receiving the common control voltages.

3. The multi-band amplifier of claim 2 , wherein the common control voltages include first to fourth control voltages, and the first decoder generates 8 control signals that consist of a plurality of bits different from each other depending on the first to fourth control voltages.

4. The multi-band amplifier of claim 3 , wherein the 8 control signals include a Bluetooth control signal, and the second amplifying unit provides a Bluetooth signal through the second antenna stage by receiving the Bluetooth control signal.

5. The multi-band amplifier of claim 1 , wherein the first amplifying unit includes: a first amplifier configured to amplify the signal within the first frequency band in a receive path of the signal within the first frequency band; and a first switching unit configured to transmit and receive the signal within the first frequency band through a switching operation between the first antenna stage and a transmission and reception path of the signal within the first frequency band, and the second amplifying unit includes: a second amplifier configured to amplify the signal within the second frequency band in a receive path of the signal within the second frequency band; and a second switching unit configure to transmit and receive the signal within the second frequency band or a Bluetooth signal through a switching operation between a transmission and reception path of the signal within the second frequency band and the Bluetooth signal and the second antenna stage.

6. The multi-band amplifier of claim 1 , wherein the signal within the first frequency band is a signal within a band of 5 GHz, and the signal within the second frequency band is a signal within a band of 2.4 GHz.

7. The multi-band amplifier of claim 1 , wherein the first amplifying unit, the second amplifying unit, and the switching control unit are electrically connected to one another on one substrate, and the switching control unit is positioned between the first amplifying unit and the second amplifying unit.

8. A multi-band amplifier of a multiple-input and multiple-output (MIMO) system, the multi-band amplifier comprising: a first amplifying module including a first amplifying unit configured to amplify a signal within a first frequency band provided by a first antenna stage, a second amplifying unit configured to amplify a signal within a second frequency band provided by a second antenna stage, and a first switching control unit configured to generate a first unit control signal to activate at least one of the first amplifying unit and the second amplifying unit depending on a plurality of first unit control voltages; a second amplifying module including a third amplifying unit configured to amplify a signal within a first frequency band provided by a third antenna stage, a fourth amplifying unit configured to amplify a signal within a second frequency band provided by a fourth antenna stage, and a second switching control unit configured to generate a second unit control signal to activate at least one of the third amplifying unit and the fourth amplifying unit depending on a plurality of second unit control voltages; and a wireless communications module that is electrically connected to the first amplifying module and the second amplifying module so as to transmit and receive the signals within the first and second frequency bands, wherein the first amplifying unit amplifies the signal within the first frequency band provided by the first antenna stage by performing a switching operation depending on the first unit control signal and the second amplifying unit amplifies the signal within the second frequency band provided by the second antenna stage by performing a switching operation depending on the first unit control signal, and the third amplifying unit amplifies the signal within the first frequency band provided by the third antenna stage by performing a switching operation depending on the second unit control signal and the fourth amplifying unit amplifies the signal within the second frequency band provided by the fourth antenna stage by performing a switching operation depending on the second unit control signal.

9. The multi-band amplifier of claim 8 , wherein the plurality of first unit control voltage and second unit control voltage that are provided to each of the first switching control unit and the second switching control unit include 4 control voltages.

10. The multi-band amplifier of claim 9 , wherein the first switching control unit and the second switching control unit include a first decoder generating 8 control signals that consist of a plurality of bits different from each other by receiving the 4 control voltages.

11. The multi-band amplifier of claim 8 , wherein the signal within the first frequency band is a signal within a band of 5 GHz, and the signal within the second frequency band is a signal within a band of 2.4 GHz.

12. The multi-band amplifier of claim 8 , wherein each of the first switching control unit and the second switching control unit includes: a bandgap reference generator generating a reference voltage; and a low dropout regulator that is electrically connected to the bandgap reference generator and generates an output voltage by dropping an input voltage so as to correspond to the reference voltage.